TCA8424
인터럽트 및 128 키를 지원하는 24비트 1.65~3.6V 1MHz I2C/SMBus 키패드 스캐너
TCA8424
- Operating Power-Supply Voltage Range of 1.65V to 3.6V
- Supports FM+ I2C Operation up to 1MHz
- Can Support up to 128 (8x16) Key Scan
- Internal Power-On-Reset
- Open Drain Open Drain Active Low INT Output
- Noise Filter on SCL/SDA and Inputs
- Open Drain Outputs Can Sink up to 12mA Current for LED
- Hardware Coded HID and REPORT Descriptors
- Available With Preprogrammed Keyboard Map
- Software Reset per HID Over I2C Standard
- Internal Pull-up Resistors Make Implementation Easy
With no Need for External Components - HID Over I2C Commands Supported
- RESET
- GET REPORT
- SET REPORT
- SET POWER
- Fixed Length 8-byte INPUT Report can Detect up to 6
Simultaneous Key Presses Excluding Modifiers (CTRL, ALT,
SHIFT) - INPUT Report Generated on Key Press and Release
- Latch-Up Performance Exceeds 100 mA Per JESD 78, Class II
- ESD Protection Exceeds JESD 22
- 1000-V Human-Body Model (A114-A)
This 128 key scan device is specifically targeted towards end equipment that runs on Windows 8 operating system. The device is fully compliant with the HID over I2C specification defined (ver 1.0) defined by Microsoft. The HID and report descriptors are hard coded into the device so that they don’t need to be programmed at production. The device also comes with a preprogrammed keyboard map that is compatible with most standard laptop/notebook keyboards. However, the device also available without a pre-programmed keyboard, so that any keyboard map may be written into it at production.
The device generates INPUT reports of standard 8-byte length with the 1st byte being the modifier byte. After the keyboard map is programmed into the device it automatically recognizes the row/column location of the modifier keys based on their usage code. It is capable of detecting and reporting up to six simultaneous key presses plus eight modifiers. It generates an input report on each key press and each key release.
The device also supports LED indicators that are standard on a keyboard. Different variations support 2,4 or 8 LED outputs. Each output has open drain architecture and is capable of sinking up to 12mA of current. The LEDs are controlled by a standard OUTPUT report as described in the HID over I2C standard.
기술 문서
유형 | 직함 | 날짜 | ||
---|---|---|---|---|
* | Data sheet | Low-Voltage 8x16 Keyboard Scanner With HID over I2C Compliant Interface datasheet | 2013/03/27 | |
Selection guide | I2C Infographic Flyer | 2015/12/03 | ||
Application note | Understanding the I2C Bus | PDF | HTML | 2015/06/30 | |
Application note | Maximum Clock Frequency of I2C Bus Using Repeaters | 2015/05/15 | ||
Application note | I2C Bus Pull-Up Resistor Calculation | PDF | HTML | 2015/02/13 | |
Application note | OTP Creation Guide | 2013/03/27 | ||
EVM User's guide | TCA8424 Evaluation Module User's Guide | 2013/02/22 |
설계 및 개발
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TCA8424EVM-038 — TCA8424EVM-038
The TCA8424 EVM showcases the capabilities and benefits of using the TCA8424 in a keyboard scanner application. This EVM is designed to allow the user to program their own OTPs and then test the OTP in a system use case.
SCDC004 — TCA8424 GUI
지원되는 제품 및 하드웨어
제품
I2C 범용 I/O(GPIO)
하드웨어 개발
평가 보드
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패키지 | 핀 | 다운로드 |
---|---|---|
VQFN (RHA) | 40 | 옵션 보기 |
주문 및 품질
- RoHS
- REACH
- 디바이스 마킹
- 납 마감/볼 재질
- MSL 등급/피크 리플로우
- MTBF/FIT 예측
- 물질 성분
- 인증 요약
- 지속적인 신뢰성 모니터링
- 팹 위치
- 조립 위치